Just like in the previous passages, Chopin wrote the necessary accidentals in A only in the first triplet in each bar. All necessary signs, including the cautionary 
before f3 in bar 479 were added in GE (→FE→EE). Moreover, GE2 added two more cautionary naturals before f2 and f. In the main text, we omit the latter.
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category imprint: Interpretations within context; Differences between sources; Editorial revisions
issues: Accidentals in different octaves, GE revisions, Inaccuracies in A
notation: Pitch